You can delete the certificates that are displayed in the list and also the applied devices.
To delete a certificate
To delete multiple certificates, select the certificates and click Delete on the top right corner.
To delete a single certificate, click ellipses icon in the ACTION column and click Delete.
On being prompted to select the devices from which the certificate(s) have to be deleted,
toggle on the button for Delete Certificate(s) from devices.
select the checkbox(es) for the applied devices you want to delete.